3BO

TMT250 battery, in the field

One deep discharge. One empty-to-full charge window. From a unit with a clearer low-to-full gap than our denser sample.

~2.5 hoursNear-empty to full (8% → 100%) — upper bound from the last low ping to the first full ping.
90% → 3%Deep discharge across ~197 h of real use in retained AVL.
Voltage agreesCharge climbed 3453 → 4152 mV in the same window.

One deep discharge discharge

This TMT250 ran from about 90% down to 3% over roughly eight days of ordinary use — a long drain you can follow in the retained pings, not a single short ride.

—Battery

—Duration

—Average rate

—Voltage

One full charge charge

At 04:35 UTC the pack was at 3% (3418 mV). By 07:06 it reported 100% (4154 mV). Charging finished inside that ~2.5 hour window.

—Battery

—Duration

—Average rate

—Voltage

How we measured

Source: prod AVL for IMEI …884900. Chosen over denser …840056 because the empty-to-full gap is observed within ~2.5 h instead of an overnight hole. Discharge is the multi-day decline to 3%.

Pings are sparse — not a fleet lifetime study. Charge duration is an upper bound between observed points. Prod Mongo currently retains little TMT history beyond a few IMEIs.